Follow-up mechanism



H. C. HAYES FOLQOW-UP MECHANISM- F'iled Jan. 2 1924 Fly] Patented Oct.21, 192%.

entree stars HARVEY c. nevus, or wasnmeron, ms'rnicr or conunnara.

rorLow-ur MECHANISM.

. application filed January 2, 1924. Serial No. 684,091. 1

To all whom it may concern:

Be it known that I, HARVEY C. HAYES, a citizen ofthe United States, andresident of Washington, District of Columbia, have 6 invented certainnew and useful Improvements in a Follow-Up Mechanism, of which thefollowing is a specification.

My invention relates to a means whereby the established position betweentwo mov- 10 able members may be maintained. 4

An object of the invention is to maintain a relative position betweentwo rotatable members without the introduction of reacting torque. W

A further object isto provide a mechanism as described that will besimple in construction and reliable in operation.

, With the above and other objects in view the invention consists in theconstruction, 20 combination and arrangement of parts as will behereinafter described.

Reference is to be had to the accompanying drawings in which likereference characters indicate corresponding parts throughas out theseveral views, and in which-'- Figure-l is a vertical sectional view,and 'Figure 2 is a view on the line 2-2 of Fi re 1. a an example I haveshown and will de so scribe my invention as applied to a gyrocompass,although it will be understood that I do not limit myself to thisparticular application, as this mechanism may be used in connection withvarious devices. 85 Referring to the drawings,1 and 2 indicate thegyro-wheel and supporting frame respectively of av gyro-compass and?)and 4 the bearings about which the frame can turn on a vertical axis.Bearing 4 is hollow to so that a stream of fluid can be forced throu hit into a T-shaped member 5 support by frame 2 and having two outlets 6and 7. The fluid emerging from these A outlets passes respectively intos lit nozzles cc 8 and 9, which direct t e flui stream to veins of twosmall'turbine wheels 10 and 11. These turbines each operate a smallHinion wheel 11 and 12 through worm rives 13 and 14. The pinion wheelsengage as in a circular rack 15 and are carried by a member 16 rotatableon bearing 17.

' When outlets 6 and 7 of the member 5 are directly opposite splitnozzles 8 and 9, the

fluid stream is accurately divided so that half emerges from each branchand under such conditions the two turbines will remain at rest, as thereaction of each branch is the same but in opposite senses with respectto turbine rotation. If the supporting frame is rotated slightly in aclockwise direction, the branch nozzles 8 and 9 will no longer equallydivide the fluid stream ,issuof one will ca more of the fluid than willthfl upper, the upper branch of the other Wlll carry more than the lowerbranch. This will cause the two turbines 10 and 11 to rotate in ananti-clockwise direction and the pitch of the worm drives 13 and 14 issuch that the action of pinion wheels 11 and 12 cause member 16, whichcarries both turbines and both nozzles to be rotated in a from member 5,but the lower branch 7 clockwise direction about bearing 17. This motionwill continue until the nozzles 8 and 9 are again brought opposite theoutlets 6 and 7 The action, of course, will be the reverse if the frameis rotated in an anticlockwise direction. It will, therefore, be

seen that however frame 2 is rotated aboutthe vertical axis, member 16will, through the action I of the two turbines operated through thesplit nozzles, be caused to folbe along a, line making an angle of 45with. the vertical axis but interse'ctin with it. torque tending torotate,the frame about its .vertical axis but will introduce a sidethrust on bearings 8 and 4. While closing one of the outlets does notafl'ect the accuracy or sensitiveness of operation to any greatextent,it is desirable to use both outlets. I

It will be understood that the above de scription and accompanyingdrawings comprehend only the general and referred embodiment of myinvention an that various This reaction will not intr uce a minorchanges in details of construction,

proportion and arrangement of parts may be made within the scope of theappended claims and Without sacrificing any of the advantages of myinvention. V

Having described my invention, I claim: 1. In a follow-up mechanism, amovable member, a fluid stream conductor having a plurality of outletscarried thereby, systems of gearing, a rotatable member, and meansderiving motion from said fluid stream for fluid stream for impartingmotion to said.

rotatable member through the gearing.

3. In a follow-up mechanism, a member movable on an axis, a memberrotatable in a plane at right angles thereto, systems of gearing, andco-acting fluid stream means carried by the respective members anddirecting a fluid stream against said gearing to cause relative movementof said members through action of said earing.

4. In a follow-up mec anism, a member movable on an axis, amemberrotatable in a plane at right angles thereto, a stationary rack adjacentto the periphery of said'rotatable-member, a fluid stream conductorhaving a plurality of outlets carried by the movable member, splitnozzles carried by the rotatable member, revolvable means carried by therotatable member and co-acting with the conductor through said splitnozzles, said means being rotated by a fluid stream passed therethrough,and means carried by the rotatable member and engaging with the rack andthe revolvable means whereby movement isv imparted to said rotatablemember upon movement of said revolvable means.

5. In a follow-up mechanism, a freely movable member, a fluid streamconductor imparting motion to said rotatable member.

' HARVEY O. HAYES.

